Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 7, NWS Baltimore/Washington

April 8, 2019King George County, Virginia; 5 counties in Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 8, 2019, 5:46 PM EDT for King George County, Virginia; 5 counties in Maryland. It was in force for 74 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 8, 2019, 5:46 PM EDT (21:46 UTC)
Expired
Apr 8, 2019, 7:00 PM EDT
In force
74 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Anne Arundel County, MD, Calvert County, MD, Charles County, MD, Prince George's County, MD, Saint Mary's County, MD, King George County, VA

The radar

The Sterling radar (KLWX), 78 km from the middle of the area, began a volume at 21:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.8 hours before the alert went out and 139 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2019-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2019-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 295 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
23 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
730 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
295 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 8, 4:10 AM EDTSmall Craft AdvisoryLWX18 hr
Apr 8, 1:14 PM EDTSmall Craft AdvisoryLWX39 hr
Apr 8, 4:20 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson58 min
Apr 8, 5:24 PM EDTSpecial Marine WarningLWX32 min
Apr 8, 5:33 PM EDTSpecial Marine WarningLWX87 min
Apr 8, 5:36 PM EDTSpecial Marine WarningLWX84 min
Apr 8, 5:36 PM EDTSpecial Marine WarningLWX25 min
Apr 8, 5:40 PM EDTSpecial Marine WarningLWX75 min
Apr 8, 5:52 PM EDTSpecial Marine WarningLWX53 min
Apr 8, 5:53 PM EDTSpecial Marine WarningLWX97 min
Apr 8, 7:23 PM EDTSpecial Marine WarningLWX31 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2019Severe Thunderstorm Warnings in Virginia, 2019Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.